Electromagnetic waves longer than infra-red but shorter than radio, in the region of the spectrum between about 3x108Hz and 3x1011Hz and wavelengths between about 10-4m and 1m.

Sufficiently short wavelength that practical use can be made of waveguide and associated cavity techniques in their transmission and reception.

See also: Cavity Wavemeter, Gyrotron, Submillimeter Wave, Wavelength.

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Subjects: Physics

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